They have multiple uses depending on the Machine, such as transform a police officer into a Patranger, activate a Keisatsu Boost, and enlarge for combat and Mecha formations. Much to their name, they act as an auxiliary replacement of the trigger of the VS Changer, the weapon that is used to activate the Machines' various abilities.

During the final showdowns with the Ganglers, it was revealed that unlike the Dial Fighters, which unlock Gangler safes, using a Trigger Machine would seal and disable them. To do so, the user of the Trigger Machines must put the them on the safe, then type new passcodes on the targeted safe, thus rendering the Gangler ability using the aforementioned safe(s) absolutely useless.

Trigger Machine 1gou

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(Translation: Thunderous Roar!)
Trigger Machine 1gou (トリガーマシン1号,Torigā Mashin Ichigō) is the personal mecha of Patren 1gou. It forms the chest and head of PatKaiser, and the hat of Good Cool Kaiser VSX. Its Attack Mode reveals another pair of wheels that increases its acceleration & speed(similar to GoGo Formula from GoGo Sentai Boukenger)

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Trigger Machine 2gou (トリガーマシン2号,Torigā Mashin Nigō) is the personal mecha of Patren 2gou. It forms the weaponized left arm of PatKaiser, and the right ankle of Good Cool Kaiser VSX. Its Attack Mode deploys the built-in cannon from its grill that is in the shape of a revolver barrel.

Trigger Machine 3gou

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Trigger Machine 3gou (トリガーマシン3号,Torigā Mashin Sangō) is the personal mecha of Patren 3gou. It forms the weaponized right arm of PatKaiser, and the left ankle of Good Cool Kaiser VSX. Its Attack Mode deploys its police baton. While it can fire basic yellow rounds at foesNumber 2: International Police, Chase After Them, it can also attack by leaning to its side then extending the baton.

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Keisatsu Gattai PatKaiser (警察合体パトカイザー,Keisatsu Gattai PatoKaizā) is the main Giant Robo of the Patrangers in Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger. It is the formation of the Trigger Machines together with the sentient GoodStriker. PatKaiser can uses Trigger Machine 3gou's arm as a baton and the Trigger Machine 2gou's arm as a gun. It can do strafing shots and hide behind buildings, using them as cover. The blue stripes on the back of the legs can ignite like rockets.

PatKaiser's finisher is the PatKaiser: Bullet Strike (パトカイザー弾丸ストライクー,Patokaizā: Dangan Sutoraiku) where the Trigger Machines build up energy and use Trigger Machine 2gou's cannon to fire powerful blasts at the enemy.

Patkaiser's team finisher with LupinRex is the Lupin & Pat's Freedom Slash (ルパン＆パッツフリーダムスラッシュ,Rupan & pattsu furīdamu surasshu); where LupinRex's power is focused into the Jackpot Blade, while PatKaiser's power is focused into Trigger Machine 3gou's baton before charging at the enemy as LupinRex and PatKaiser simultaneously cross attack the enemy.

In PatKaiser formations, the Patrangers do the announcements (form changes, finishers).

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PatKaiser Biker (パトカイザバイカー, PatoKaizā Baikā) is the combination between Keisatsu Gattai PatKaiser and Trigger Machine Biker. In this form, PatKaiser can attack with The Biker's front wheel, behaving like a yo-yo for whipping, grappling, and sweeping attacks.

The finishing move is called PatKaiser: Lock-Up Strike (パトカイザーロックアップストライク, PatoKaizā: Rokku Appu Sutoraiku), where PatKaiser throws the enemy into the air with the Biker wheel and Trigger Machine 2gou's cannon then fires a series of shots at the monster above the Mecha, destroying him/her.

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PatKaiser Strong (パトカイザ強いバイカー, PatoKaizā Strongu) is the combination of Trigger Machine 1gou, Trigger Machine 2gou, Trigger Machine Crane, Trigger Machine Drill, and GoodStriker. In this form, PatKaiser can attack with Crane's telescopic boom, with it extending and retracting when needed. Trigger Machine Drill is used like a sword/thrusting weapon.

The finishing move is called PatKaiser: Break-Up Strike (パトカイザーブレークアップストライク,PatoKaizā: Burēku Appu Sutoraiku), where PatKaiser grabs and drags the enemy into the air with the crane hook and as it retracts thus swinging the monster down, Drill impales the monster full force, thus destroying it.

This combination was formed when the Red Dial Fighter forcibly replaced Trigger Machine 1gou during the formation of PatKaiser. Despite conflict between Lupin Red, Patren 2gou, and Patren 3gou inside the cockpit, it was able to hold off Anidara Maximoff long enough for Lupin Red to activate the Blade Dial Fighter to unlock his safe. The Trigger Machines were tossed onto Anidara as the Lupinrangers formed LupinKaiser Cyclone Knight once Lupin Blue and Lupin Yellow retrieved the The stroke of luck/Le coup de chance.

The formation can use the extending and retracting abilities of both arms. This is taken up a notch when Sakuya took the lead, and did a three-pronged attack with Drill constantly going forward and back on Pyodor in the style of Sakuya's aerobicsNumber 27: Dancing Afterwards.

Its finisher is called PatKaiser: Lift-Up Strike (パトカイザリフトアップストライク,PatoKaizā: Rifuto Appu Sutoraiku), where Trigger Machine Crane lifts up the enemy like a fisher and Trigger Machine Biker uses its extending front wheel to pummel the enemy mid-air, destroying him/her.

Its alternate finisher is the PatKaiser: Thrust-Up Strike, where Crane's hook extends to pin a target against a surface. Then, Drill races down the boon to bore through the target, destroying him/herNumber 33: We Are The Youth Thief Brigade

Its finisher is the PatKaiser: Spark-Up Strike (パトカイザスパークアップストライク,PatoKaizā: Supāku Appu Sutoraiku), where X Train Thunder charges up with electricity and slashes the enemy three times until they're destroyed.

Appearances: Lupinranger vs Patranger Episodes 21, 33

Notes

While the Trigger Machines are designed with elements standard of most police forces, the Attack Modes of Trigger Machines 1gou and 2gou have similar elements to the respective red and green mecha of Tokusou Sentai Dekaranger.(Patstriker is a 6-wheeled police car and Patrailer can reveal and use a laser weapon.)

Additionally, Patkaiser's head resembles a S.W.A.T. mask and helmet.

Trigger Machine 2gou’s Attack mode is also similar to Engine Gunpherd from Engine Sentai Go-onger(both Mecha being police car-like vehicles that can fire a laser from the front.)

While this is not the first SentaiRobo to use a bat-like or blunt weapon, it is the first primary Sentai Robo to use a bat-like weapon as its main weapon in contrast to a sword.

It is the first Robo in a police-themed Sentai to use, particularly, a police baton as its main melee weapon.

PatKaiser uses a strafing dive shot that (production-wise) takes advantage and makes use of CGI to be more agile in movement, similar to Dekaranger Robo.